Effects of Principal Stress Rotation on Permanent Deformation in Rail Track Foundations
Effects of Principal Stress Rotation on Permanent Deformation in Rail Track Foundations
A realistic assessment of the whole life cost of rail track foundations requires analysis of the effects of the repeated loadings applied by trains. This paper reports the effects of principal stress rotation (PSR) during cyclic loading on the permanent deformations measured in a series of hollow cylinder tests. The tests were carried out on a number of reconstituted soils selected in order to simulate foundation materials on an existing heavy haul railway line. Typical loadings and track geometry together with dynamic finite-element analyses were used to define representative stress changes to be applied to these soils, which were then tested with and without principal stress rotation during loading. It is shown that principal stress rotation has a significant and deleterious impact on permanent deformation of some materials. Therefore, it is concluded that cyclic triaxial testing, which cannot impose principal stress rotation, will not necessarily give good estimates of the long-term performance of rail track foundations. As PSR cannot be ignored when evaluating permanent displacements of rail track foundations, the use of more appropriate (realistic) testing methods such as the cyclic hollow cylinder or the cyclic simple shear apparatus is required
555-565
Grabe, P.J.
bb504678-efda-4320-8f08-1905716b1ebb
Clayton, C. R. I.
8397d691-b35b-4d3f-a6d8-40678f233869
April 2009
Grabe, P.J.
bb504678-efda-4320-8f08-1905716b1ebb
Clayton, C. R. I.
8397d691-b35b-4d3f-a6d8-40678f233869
Grabe, P.J. and Clayton, C. R. I.
(2009)
Effects of Principal Stress Rotation on Permanent Deformation in Rail Track Foundations.
Journal of Geotechnical and Geoenvironmental Engineering, 135 (4), .
(doi:10.1061/(ASCE)1090-0241(2009)135:4(555)).
Abstract
A realistic assessment of the whole life cost of rail track foundations requires analysis of the effects of the repeated loadings applied by trains. This paper reports the effects of principal stress rotation (PSR) during cyclic loading on the permanent deformations measured in a series of hollow cylinder tests. The tests were carried out on a number of reconstituted soils selected in order to simulate foundation materials on an existing heavy haul railway line. Typical loadings and track geometry together with dynamic finite-element analyses were used to define representative stress changes to be applied to these soils, which were then tested with and without principal stress rotation during loading. It is shown that principal stress rotation has a significant and deleterious impact on permanent deformation of some materials. Therefore, it is concluded that cyclic triaxial testing, which cannot impose principal stress rotation, will not necessarily give good estimates of the long-term performance of rail track foundations. As PSR cannot be ignored when evaluating permanent displacements of rail track foundations, the use of more appropriate (realistic) testing methods such as the cyclic hollow cylinder or the cyclic simple shear apparatus is required
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Published date: April 2009
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Local EPrints ID: 76030
URI: http://eprints.soton.ac.uk/id/eprint/76030
ISSN: 1090-0241
PURE UUID: 73289866-7f98-4274-9b8b-0a14e4d468fd
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Date deposited: 11 Mar 2010
Last modified: 14 Mar 2024 02:43
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P.J. Grabe
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